The wedge metronome (~300s: 297/297/322/437s across bus widths, clocks, and power modes) matches FRITZ DHCP T1 renewal at half of a 10-min lease. Every wedging build ran an active dhcp client. Static addressing removes the renewal TX path entirely; if the metronome dies, root cause #2 is the DHCP renew packet through hosted's write path. (2.9.7 experiment abandoned: slave image bootloops/rolls back on this C6; version matrix documented for upstream.) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>